login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A336738 Primes abs(A335592(k))/2 for k in A335593. 4
1399, 17939, 32869, 149759, 282349, 458929, 388099, 615389, 634169, 585619, 926179, 1053449, 1876339, 1336529, 2056829, 2156369, 2695249, 2653699, 2819779, 2501449, 1461709, 2176679, 3457969, 2549479, 3433819, 5299219, 4845499, 4774619, 7874749, 8796049, 9139469, 9029399, 7075759, 5156299 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms end in 9 (or 1, if there are any with A335592(k) < 0).

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = abs(A335592(A335593(n)))/2.

EXAMPLE

A335593(3) = 27, A335592(27) = det(631, 563; 577, 619) = 65738 = 2*32869

so a(3) = 32869.

MAPLE

count:= 0: R:= NULL:

L:= [-9, -7, -3, -1]:

for k from 1 while count < 100 do

  for i from 1 to 4 do

   for x from L[i]+10 by 10 do until isprime(x);

   L[i]:= x;

  od;

  v:= L[1]*L[4]-L[2]*L[3];

  if isprime(abs(v)/2) then count:= count+1; R:= R, abs(v)/2; fi

od:

R;

CROSSREFS

Cf. A335592, A335593.

Sequence in context: A110844 A015990 A065214 * A271549 A203918 A178271

Adjacent sequences:  A336735 A336736 A336737 * A336739 A336740 A336741

KEYWORD

nonn,base,look

AUTHOR

J. M. Bergot and Robert Israel, Jan 27 2021

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 15 16:43 EDT 2021. Contains 348033 sequences. (Running on oeis4.)